Watch This: Mysteries of the dark universe, glowing bugs, and more

These 'worms' glow in the dark. Plus, a Hong Kong trolley ride, saving rare seabirds, and more. [WATCH MORE VIDEOS]( [JOIN]( ONLINE]( [{PREHEADER}]( [National Geographic]( [WATCH THIS]( . [ANIMALS]( | [EXPLORERS]( | [NEWS]( | [ADVENTURE]( See our producers’ favorite videos of the week. . [2:41 | Short Film Showcase]( [Get Lost in Hong Kong on a 3-Minute Trolley Adventure]( Who doesn’t love cheap and convenient public transportation? In Hong Kong, their iconic streetcar system has been popular with locals and tourists for more than 100 years. Hop on board some of these legendary trams and explore the city's vibrant streets with filmmaker Brandon Li. — Lauren Leadmon, associate producer [WATCH NOW]( SHARE [F]( [T]( . [0:43 | NEWS]( [The Railroad Worm Glows in the Dark, as a Warning]( I've had the pleasure of producing videos on [bioluminescent animals]( in the past and am still excited to see more of nature's glowing creatures. The railroad worm is aptly named because it looks like the lights one would see on the side of railroad or subways tracks. It's not actually a worm, but the larva of the beetle species Stenophixothrix fusca. Its glow serves as a survival mechanism, which makes the phenomenon much more fascinating. — [Jennifer Murphy]( producer/editor [WATCH NOW]( SHARE [F]( [T]( [EXPLORING SINCE 1888 | SUBSCRIBE NOW +]( [EXPLORING SINCE 1888 | SUBSCRIBE NOW +]( . [4:41 | News]( [How Engineers Hack Cameras to Photograph and Study Sharks and Lions]( Hidden deep below National Geographic’s HQ in Washington, D.C., lies one of its most important and unique departments: engineering. The engineers are tasked with creating, hacking, and modifying cameras that can fit onto a wide range of wild animals in order to capture critical research and stunning visuals. In this video, hear from some of the engineers about their experiences working at Nat Geo, including when one fell into the water while attempting to attach a camera to a great white shark. — [Nick Lunn]( producer/editor [WATCH NOW]( SHARE [F]( [T]( . [2:47 | 101 Videos]( [Explore Mysteries of the Dark Universe]( I have always been equal parts enamored and overwhelmed with the cosmos. Filled with seemingly endless possibilities, trying to understand the universe often produces more questions than answers. In this short explainer, our team explores what is perhaps one of the largest space mysteries: the dark universe. Take a minute to question the unknown and catch up on what we do know about dark energy and dark matter. — [Crystal Berg]( associate producer [WATCH NOW]( SHARE [F]( [T]( . [5:07 | Magazine]( [This Plan to Save a Rare Albatross From Extinction Just Might Work]( For most people, seabirds are out of sight and out of mind. But climate change, fisheries, pollution, habitat loss, and invasive species have led to a shocking decline of nearly 70 percent since the 1950s. Of 360 species of seabirds, 110 of them are under threat. But this microcosm within the [larger story]( a sign of hope. We don’t often get to report on positive environmental news, but when we do, it’s remarkable. — Gabbi Ewing, associate producer/editor [WATCH NOW]( SHARE [F]( [T]( READY TO WATCH MORE NAT GEO VIDEOS? Explore your world with thousands more videos from National Geographic. [WATCH NOW]( [Shop]( [Donate]( [Subscribe]( [Travel]( [READ OUR LATEST STORIES]( [SHOP]( [DONATE]( [SUBSCRIBE]( [TRAVEL]( [FROM LENS TO LIVING ROOM | SUBSCRIBE NOW +]( [FB]( [Twitter]( [IG]( [YouTube]( Our video player is currently experiencing difficulties in Safari 11. Please try using another browser. You are receiving this email because you elected to receive marketing communications from National Geographic under the terms of our [Privacy Policy](. If you reside in the European Economic Area and wish to withdraw your consent to receive marketing communications, please [click here](. For all others, click here to [unsubscribe](. [About Us]( | [Contact Us]( | [Privacy Policy]( To ensure that you receive your National Geographic emails, please add ng@e.nationalgeographic.com to your address book now. [Learn how](. National Geographic | 1 145 1 7th Street N.W. | Washington, D.C. 2 0036 Copyright © 2018 National Geographic Partners, LLC. All rights reserved. {LITMUS TRACKING PIXEL}